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Low refractive index coating composition for use in antireflection polymer film coatings and manufacturing method

a polymer film, low refractive index technology, applied in the direction of synthetic resin layered products, instruments, transportation and packaging, etc., can solve the problems of reducing the surface energy of the coating layer, reducing the interfacial adhesion of the fluoropolymer layer to the other polymer or substrate layer, and reducing the viscosity of the polymer material, etc., to achieve good wetting, adequate viscosity performance, and easy manufacturing

Inactive Publication Date: 2008-05-20
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]The present invention provides a silicone-modified fluoropolymer that is formed by first dissolving a fluoropolymer having at least one monomer of vinylidene fluoride coupled to a hexafluoropropylene monomer unit in an organic solvent and subsequently reacting the mixture with an amino silane coupling agent to form an aminosilane-modified fluoropolymer. The aminosilane fluoropolymer is subsequently heated and partially condensed with an oligomer of a silane compound including alkoxy silane. The resultant composition is ideally suited as a low refractive index layer in an AR film because the material shows good wetting to underlying or overlying materials and substrates and further has adequate viscosity performance. The material is durable and relatively easy to manufacture. This material is also suited as a low refractive index layer in a transferable AR film.

Problems solved by technology

However, increasing the fluorine content also decreases the surface energy of the coating layers, which in turn reduces the interfacial adhesion of the fluoropolymer layer to the other polymer or substrate layers to which the layer is coupled.
Further, silicone-containing polymeric materials have a lower viscosity that leads to defects in ultra-thin coatings (less than about 100 nanometers).

Method used

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  • Low refractive index coating composition for use in antireflection polymer film coatings and manufacturing method
  • Low refractive index coating composition for use in antireflection polymer film coatings and manufacturing method
  • Low refractive index coating composition for use in antireflection polymer film coatings and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Fluoro-plastic / Silicone Alkoxy Oligomer System (“L-1”)

(a) Modification of Fluoroplastic

[0050]4 g of THV 220 (Dyneon) were dissolved in MEK and 40 g of a 10 weight percent solution was prepared. In the solution, 255 g of ethyl acetate and 0.74 g of a 60% by weight solution of oligomerized amino silane coupling agent (LJ-292130, Sumitomo 3M) were added and mixed. The solution was allowed to sit in an airtight container for 10 days under ambient conditions. After 10 days, the solution, known as a modified polymer solution, was slightly yellow. The solids percentage was about 1.5 weight percent and the weight ratio of THV 220 to oligomerized amino silane coupling agent was 90 / 10.

(b) Condensation with Silicone Alkoxy Oligomer

[0051]10 g of the modified polymer solution, 0.65 g of an organic alkoxy silane oligomer (SI oligomer 2, GE Toshiba silicone), 0.33 g of an oligo tetra methoxy silane (X40-2308, Shinetsu chemical), 4.9 g of methyl amyl ketone and 9.11 g of Ethyl acetat...

example 2

Preparation of Fluoro-Plastic / Silicone Alkoxy Oligomer System (“L-2”)

(a) Modification of Fluoroplastic

[0053]4 g of THV 220 (Dyneon) were dissolved in MEK and 40 grams of a 10 weight percent solution was prepared. In the solution, 240.5 g of THF and 0.21 g of an amino silane coupling agent (KBM-903, Shinetsu chemical) were added and mixed. The solution was then allowed to sit in an airtight container for 10 days under ambient conditions. After 10 days, the solution was slightly yellow. The measured solids percentage of the mixture was about 1.5 weight percent and the weight ratio of THV 220 / KBM-903 was measured at 95 / 5.

(b) Condensation with Silicone Alkoxy Oligomer

[0054]10 g of the modified polymer solution, 0.9 g of an organic alkoxy silane oligomer (SI oligomer 2, GE Toshiba silicone), 0.63 g of an oligo tetra methoxy silane (X40-2308, Shinetsu chemical), and 7.23 g of THF were mixed in a container. The mixture was then coated onto a PET substrate material using a Mayer bar, and th...

example 3

Preparation of Fluoro-elastomer / Silicone alkoxy oligomer system (“L-3”)

(a) Modification of Fluoroelastomer

[0057]40 g of FT-2430 (Dyneon) were dissolved in MEK and 400 grams of a 10 weight percent solution was prepared. In the solution, 1001.4 g of THF and 2.11 g of an amino silane coupling agent (KBM-903, Shinetsu chemical) were added and mixed. This solution was allowed to sit in an airtight container for 10 days under ambient conditions. After 10 days, the solution was slightly yellow. The solids percentage was measured at about 3.0 weight percent and the weight ratio of FT-2430 / KBM-903 was determined to be 95 / 5.

(b) Condensation with Silicone Alkoxy Oligomer

[0058]400 g of the modified polymer solution, 72 g of an organic alkoxy silane oligomer (SI oligomer 2, GE Toshiba silicone), 50 g of an oligo tetra methoxy silane (X40-2308, Shinetsu chemical), 24 g of THF and 54 g of PMA were mixed in a container. The mixture was then coated onto a PET substrate material using a Mayer bar, an...

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Abstract

A silicone-modified fluoropolymer is formed by first dissolving a fluoropolymer in an organic solvent, the fluoropolymer having at least one monomer of vinylidene fluoride coupled to a hexafluoropropylene monomer unit, and subsequently reacting the mixture with an amino silane coupling agent to form an aminosilane-modified fluoropolymer. The aminosilane fluoropolymer is subsequently heated and partially condensed with an oligomer of a silane compound including alkoxy silane. The resultant composition is suitable for use as a low refractive index layer in an antireflection coating on an optical substrate.

Description

TECHNICAL FIELD AND INDUSTRIAL APPLICABILITY OF THE INVENTION[0001]The present invention relates to a coating composition and more specifically to a low refractive index composition for an antireflection polymer film.BACKGROUND OF THE INVENTION[0002]Antireflective polymer films (“AR films”), or AR coatings, are becoming increasingly important in the display industry. New applications are being developed for low reflective films and other AR coatings applied to articles used in the computer, television, appliance, mobile phone, aerospace and automotive industries.[0003]AR films are typically constructed by alternating high and low refractive index polymer layers in order to minimize the amount of light that is reflected. Desirable features in AR films for use on the substrate of the articles are the combination of a low percentage of reflected light (e.g. 1.5% or lower) and durability to scratches and abrasions. These features are obtained in AR constructions by maximizing the delta ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B25/20B32B27/26C08F8/00C08L27/24C08L83/04
CPCC08G77/442G02B1/111Y10T428/24942Y10T428/25Y10T428/3154Y10T428/31663
Inventor MIZUNO, KAZUHIKO
Owner 3M INNOVATIVE PROPERTIES CO
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